Keyboard



FIG. 1 is a front perspective view of a keyboard showing the claimed design;

FIG. 2 is another front perspective view of FIG. 1;

FIG. 3 is rear perspective view of FIG. 1;

FIG. 4 is a front elevational view of FIG. 1;

FIG. 5 is a rear elevational view of FIG. 1;

FIG. 6 is a left side elevational view of FIG. 1;

FIG. 7 is a right side elevational view of FIG. 1;

FIG. 8 is a top plan view of FIG. 1; and,

FIG. 9 is a bottom plan view of FIG. 1.

The broken lines in the figures represent portions of the article which form no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 